Speedometer lubrication

[Catz]

I've got this old Smiths Chronometric speedo for the A10 which came with a load of spares that i bought.
I'm wondering what's the best oil to use for lubrication.
I've read WD40 is a no go but also read that watch or clockmakers lube is good. What about 3 in 1 oil?
The speedo works because i've tried it with a drill in reverse. I've had the bezel off, just with my bare hands amazingly, but must have been off before i tried.
Don't know what the previous owner did but he set the mileage and trip meter both at zero.
I've used the search button here and on the BSAOC forum.

[CheeserBeezer]

According to Russel Smalley of 'Chronometrics' you should not attempt to lubricate the speedometer at all. Some parts of the mechanism rely on friction, particularly the trip and odometer rollers.

[Catz]

Thanks for that mate. I'll give it a go without then.

[Klaus]

But have a close look at the axes from the Milecounter or Tripcounter. If they run dry and go hard to turn you damage the drivewheel. Juse only a half drop of Sewingmashineoil.  There is a small recess in the axle; oil it there.

Chers Klaus

[Catz]

Thanks for the tip.

[Catz]

use only a half drop

Chers Klaus

  I'll try